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"So I fled the caliphate. Now all I want to do is go home to Britain."

On her life, she told The Times: "Mostly it was normal life in Raqqa, every now and then bombing and stuff.

"When I saw my first severed head in a bin, it didn't faze me at all. It was from a captured fighter seized on the battlefield, an enemy of Islam. I thought only of what he would have done to a Muslim woman if he had the chance."

She added: "I am not the same silly little 15-year-old schoolgirl who ran away from Bethnal Green four years ago. And I don't regret coming here."

Ms Begum was one of three girls from the same school in the east London district of Bethnal Green who ran away to join ISIS in 2015. Another girl from the same area left the year before.

One of the girls, Kadiza Sultana, was reportedly killed and the other two, Sharmeena Begum - no relation - and Amira Abase stayed on in Baghouz.